Electric pump

Abstract

The present application discloses an electric pump. The electric pump comprises a stator assembly; the stator assembly comprises a stator winding and a stator housing; the stator housing comprises a first housing and a second housing; the first housing is formed by injection molding at least with the stator winding as an insert; a first assembly is defined; the first assembly comprises the stator winding and the first housing; the second housing is formed by injection molding at least with the first assembly as an insert; the electric pump is provided with an impeller cavity; the electric pump comprises a first backflow channel; the wall forming the first backflow channel is at least partially located in the second housing; the first backflow channel is communicated with the impeller cavity; and the first backflow channel provides a path for a working medium to return to the impeller cavity. In this way, the impact on the hydraulic efficiency of the electric pump is reduced.

Description

electric pump

[0001] This application claims priority to the following Chinese patent applications: Chinese patent application No. 202311841269.8, filed with the State Intellectual Property Office on December 28, 2023, entitled “Electric Pump”; Chinese patent application No. 202311845562.1, filed with the State Intellectual Property Office on December 28, 2023, entitled “Electric Pump”; and Chinese patent application No. 202311852511.1, filed with the State Intellectual Property Office on December 28, 2023, entitled “Electric Pump”. The entire contents of each of these applications are incorporated herein by reference.

Technical field

[0002] The present application relates to the field of fluid control, and in particular to an electric pump for automotive, energy storage, or commercial use. [Background Technology]

[0003] The electric pump includes a stator assembly, and the stator assembly includes a stator winding. During the operation of the electric pump, the stator winding will generate a certain amount of heat. Part of the heat generated by the winding part close to the outer wall of the stator winding is usually dissipated out of the electric pump by liquid cooling, which currently has a great impact on the hydraulic efficiency of the electric pump. [Summary of the invention]

[0004] The object of the present invention is to provide an electric pump that is conducive to reducing the impact on the hydraulic efficiency of the electric pump.

[0005] To achieve the above-mentioned objectives, an embodiment provided in the present application adopts the following technical solution: an electric pump, the electric pump includes a stator assembly, the stator assembly includes a stator winding and a stator housing, the stator housing includes a first housing and a second housing, the first housing is formed by at least insert injection molding with the stator winding as an insert, a first assembly is defined, the first assembly includes the stator winding and the first housing, the second housing is formed by at least insert injection molding with the first assembly as an insert, the electric pump has an impeller chamber, the electric pump includes a first return channel, the wall forming the first return channel is at least partially located in the second housing, the first return channel is connected to the impeller chamber, and the first return channel provides a path for the working medium to return to the impeller chamber.

[0006] In one embodiment of the present application, the electric pump includes a first return channel. A wall forming the first return channel is at least partially located within the second housing. The first return channel communicates with the impeller chamber and provides a path for the working medium to return to the impeller chamber. This application helps reduce the pressure differential required for the working medium to return to the impeller chamber, thereby reducing the impact on the hydraulic efficiency of the electric pump.

Brief Description of the Drawings

[0007] FIG1 is a schematic perspective view of a first embodiment of an electric pump according to the present invention;

[0008] FIG2 is a schematic diagram of the explosion structure of the first embodiment of the electric pump in FIG1 ;

[0009] FIG3 is a schematic cross-sectional view of the first embodiment of the electric pump in FIG1 along XX;

[0010] FIG4 is a schematic diagram of the three-dimensional structure of the first embodiment of the stator winding in FIG1 ;

[0011] FIG5 is a schematic perspective structural diagram of a first embodiment of the first component in FIG1 ;

[0012] FIG6 is a schematic perspective structural diagram of a first embodiment of the stator assembly in FIG1 ;

[0013] FIG7 is a schematic diagram of the cross-sectional structure along line YY in FIG6 ;

[0014] FIG8 is a schematic diagram of the structure viewed from the front along the direction C in FIG6;

[0015] FIG9 is a schematic diagram of an enlarged structure of FIG8;

[0016] FIG10 is a schematic diagram of the three-dimensional structure of the second housing in FIG6 in one direction;

[0017] FIG11 is a schematic diagram of the three-dimensional structure of the first embodiment of the bottom shell in FIG2 in one direction;

[0018] FIG12 is a schematic diagram of the three-dimensional structure of the first embodiment of the bottom shell in FIG2 in another direction;

[0019] FIG13 is a schematic diagram of the cross-sectional structure along the ZZ direction in FIG12;

[0020] FIG14 is a schematic cross-sectional view of the second embodiment of the electric pump in FIG1 along XX;

[0021] FIG15 is a schematic diagram of the structure of FIG14 with the end cover and the control board assembly removed, viewed from the D direction;

[0022] FIG16 is a schematic cross-sectional view of the third embodiment of the electric pump in FIG1 along XX;

[0023] FIG17 is a schematic cross-sectional view of the fourth embodiment of the electric pump in FIG1 along XX;

[0024] FIG18 is a schematic diagram of the three-dimensional structure of the pump cover in one direction in FIG2, FIG14, FIG16, and FIG17;

[0025] FIG19 is a schematic structural diagram of the covered surface, the open surface, and the portion where the conductive member is connected to the winding, projected onto the first reference plane;

[0026] FIG20 is a schematic diagram of the enlarged structure of point II in FIG3;

[0027] FIG21 is a schematic diagram of the three-dimensional structure of the control panel assembly in one direction in FIG19 , FIG2 , FIG14 , FIG16 , and FIG17 ;

[0028] FIG22 is a schematic diagram of the three-dimensional structure of the control panel assembly in FIG2, FIG14, FIG16, and FIG17 in another direction;

[0029] FIG23 is a schematic cross-sectional view of the fifth embodiment of the electric pump in FIG1 along line XX;

[0030] FIG24 is an enlarged structural diagram of point III in FIG3;

[0031] FIG25 is a schematic cross-sectional view of the sixth embodiment of the electric pump in FIG1 along line XX;

[0032] FIG26 is a schematic diagram of the cross-sectional structure along line VV in FIG25;

[0033] FIG27 is a schematic cross-sectional view of the seventh embodiment of the electric pump in FIG1 along line XX;

[0034] FIG28 is a schematic diagram of the bottom shell in FIG27 when viewed from above in one direction.

[0035] In the drawings: 100, electric pump; 11, pump cover; 111, inlet; 112, outlet; 12, stator assembly; 121, stator housing; 1211, first housing; 1212, second housing; 1212a, barrel; 1212b, radially extending portion; 1212c, outer peripheral sidewall; 1212d, bottom; 1212e, outer wall; 1212f, inner wall; 1212g, front bottom surface; 1212h, rear bottom surface; 1212m, covered surface; 1212n, open surface; 122, stator winding; 1221, stator core; 1222, insulating frame; 1223, winding; 13, partition; 131, contact portion; 132, connecting portion; 14. Inner cavity; 141. Rotor cavity; 142. Impeller cavity; 1421. Volute cavity; 1422. Non-volute cavity; 15. Rotating assembly; 151. Rotor assembly; 152. Impeller assembly; 16. Connecting cavity; 161. Peripheral side portion; 1611. First periphery side portion; 1611a. First sub-peripheral side portion; 1611b. Second sub-peripheral side portion; 1612a. Third sub-peripheral side portion; 1612b. Fourth sub-peripheral side portion; 1612. Second periphery side portion; 1613. Third periphery side portion; 1613a. Fifth sub-peripheral side portion; 1613b. Sixth sub-peripheral side portion; 1614. Fourth periphery side portion; 1614a. Seventh sub-peripheral side portion; 1614b. Eighth sub-peripheral side portion; 17. Through-channel; 18. Shaft; 181. Fixing portion; 182. Extending portion; 1811. First end portion; 19. Heat-conducting portion; 20. First return channel; 20', Second return channel; 21. End cap; 22. Control board assembly or adapter board assembly; 221. Baseboard; 222. Electronic components; 2211. Front surface; 2212. Back surface; 2221. Heat-generating electronic components; 23. Inlet channel; 231. First wall portion; 232. Second wall portion; 24. Stator cavity; 25. First assembly; 251. Upper end portion; 252. Lower end portion; 253. Inner portion; 254. Outer portion; 26. Bottom shell; 261. Support portion; 262. Cover portion; 263. Jack; 2611. First sub-portion; 2612. Second sub-portion; 27. Conductive portion; 271. Conductive member; 272. Connector; 28. Control cavity; 2721. First electrical connection section; 2722. Injection molding section; 2723. Power connection section; 273. Inner hole; 101. First reference plane; S1. First heat dissipation path; S2. Second heat dissipation path; S3. Third heat dissipation path, S4. Fourth heat dissipation path. [Specific implementation method]

[0036] The following further describes the implementation of the present application in conjunction with the accompanying drawings:

[0037] The following further details the specific embodiments of the present application in conjunction with the accompanying drawings. First, it should be noted that directional terms such as "up," "down," "left," "right," "front," "rear," "inside," "outside," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the structures shown in the corresponding drawings. These are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0038] The electric pump in the following embodiments can provide flow power for the working medium of the automotive thermal management system. The working medium can be water or an aqueous solution, such as an aqueous solution including 50% ethylene glycol. Of course, the working medium can also be other substances.

[0039] Referring to Figures 1 to 20 , the present application provides an electric pump 100, comprising a pump cover 11, a stator assembly 12, a partition 13, a rotating assembly 15, and a shaft 18. The stator assembly 12 comprises a stator winding 122 and a stator housing 121. The stator winding 122 comprises a stator core 1221, an insulating frame 1222, and a winding 1223. The pump cover 11 is sealed and fixedly connected to the stator assembly 12. It should be noted that the sealing and fixing herein means that, when the electric pump 100 is in operation, the working medium within the electric pump 100 will not leak out of the electric pump 100 through the interface between the pump cover 11 and the stator assembly 12. The shaft 18 is fixedly connected to the stator assembly 12. Specifically, the shaft 18 is injection-molded and fixed to the stator housing 121. It is understood that a portion of the shaft 18 is embedded within the stator housing 121. Specifically, the shaft 18 includes a fixing portion 181, which is embedded within the stator housing 121. This method helps simplify the manufacturing steps of the electric pump. The electric pump 100 has an inner cavity 14, with a rotating assembly 15 located in the inner cavity 14. The inner cavity 14 includes a rotor cavity 141 and an impeller cavity 142, and the rotor cavity 141 and the impeller cavity 142 are connected. The inner cavity 14 can allow the flow of a working medium. The rotating assembly 15 includes a rotor assembly 151 and an impeller assembly 152. The rotor assembly 151 includes a permanent magnet. At least a portion of the rotor assembly 151 is located in the rotor cavity 141, and the impeller assembly 152 is located in the impeller cavity 142. In a specific embodiment, the other end of the shaft 18 is at least partially located in the rotor cavity 141, at least a portion of the rotating assembly 15 is sleeved around the outer circumference of the shaft 18, and a portion of the shaft 18 is fixed to the stator housing 121. The rotating assembly 15 can rotate about the shaft 18. Of course, in other embodiments, the rotating assembly 15 and the shaft 18 are fixedly connected, and the shaft 18 rotates with the rotating assembly 15. The electric pump 100 may further include a control board assembly 22 electrically connected to the stator assembly 12. Alternatively, the electric pump 100 may not include the pump cover 11, with the pump cover 11 being integrated into an external structure. This arrangement facilitates the integrated design of the electric pump 100, making the structure of the electric pump 100 more compact and contributing to miniaturization and lightweighting of the electric pump 100. The pump cover 11 has an inlet 111 and an outlet 112. The inlet 111 is used for the working medium to flow into the electric pump 100, and the outlet 112 is used for the working medium to flow out of the electric pump 100. When the electric pump 100 is working, the electric pump 100 is connected to an external power supply, and the excitation magnetic field generated by the stator winding 122 is controlled by controlling the current of the stator winding 122. The rotating component 15 rotates around the axis 18 under the action of the excitation magnetic field, so that the working medium entering the inner cavity 14 through the inlet 111 rotates with the rotating component 15. Under the action of centrifugal force, the working medium will leave the electric pump 100 through the outlet 112.

[0040] As shown in Figure 4, the stator winding 122 includes a stator core 1221, an insulating frame 1222 and a winding 1223. The number of windings 1223 is at least three. The insulating frame 1222 covers at least part of the surface of the stator core 1221. The insulating frame 1222 is used to isolate the winding 1223 from the stator core 1221, so that the winding 1223 and the stator core 1221 are electrically insulated. The insulating frame 1222 and the stator core 1221 can be an integral structural component. Specifically, as an implementation method, the insulating frame 1222 is formed by injection molding with the stator core 1221 as an insert. Of course, as other embodiments, the insulating frame 1222 and the stator core 1221 are separately set. Here, "separate setting" means that the insulating frame and the stator core 1221 are processed into two separate parts and then assembled. They are limitedly connected or fixedly connected by assembly. In this embodiment, the insulating frame 1222 is formed by injection molding with the stator core 1221 as an insert. It will be appreciated that the stator core 1221 and the insulating frame 1222 form an integrated structure. The windings 1223 are wound around the insulating frame 1222. In one specific embodiment, the windings 1223 include nine windings. Of course, in other embodiments, the windings 1223 may also include other numbers of windings, such as three, six, or twelve.

[0041] During the operation of the electric pump, the stator winding will generate a certain amount of heat. Part of the heat generated by the winding part close to the outer wall of the stator winding is usually dissipated out of the electric pump by air cooling, which makes the heat dissipation efficiency of the stator winding low.

[0042] As an implementation method, please refer to Figures 1 to 10, an electric pump 100, the electric pump 100 includes a stator component 12, the stator component 12 includes a stator winding 122 and a stator housing 121, the stator housing 121 includes a first housing 1211 and a second housing 1212, the first housing 1211 is formed by at least insert injection molding with the stator winding 122, a first component 25 is defined, the first component 25 includes the stator winding 122 and the first housing 1211, the second housing 1212 is formed by at least insert injection molding with the first component 25, the electric pump (100) has an impeller chamber (142), the electric pump 100 includes a first return channel 20, the wall forming the first return channel 20 is at least partially located in the second housing 1212, the first return channel 20 is connected to the impeller chamber 142, and the first return channel 20 provides a path for the working medium to return to the impeller chamber 142. The present application is beneficial to reducing the pressure difference required for the working medium to return to the impeller chamber, thereby helping to reduce the impact on the hydraulic efficiency of the electric pump.

[0043] Please refer to Figures 1 to 10. As an implementation method, an electric pump 100 is provided. The electric pump 100 includes a stator assembly 12, the stator assembly 12 includes a stator winding 122 and a stator housing 121, the stator housing 121 includes a first housing 1211 and a second housing 1212, the first housing 1211 is formed by at least insert-molding the stator winding 122, a first component 25 is defined, the first component 25 includes the stator winding 122 and the first housing 1211, the second housing 1212 is formed by at least insert-molding the first component 25, the electric pump 100 includes an inlet channel 23, a wall forming the inlet channel 23 is at least partially located in the second housing 1212, at least part of the inlet channel 23 extends along the axial direction of the electric pump, and along the radial direction of the electric pump 100, the inlet channel 23 is located radially outside the first component 25, and the inlet channel 23 can store or flow working medium. In this manner, first, the inlet channel 23 is positioned radially outward from the first assembly 25. Compared to conventional solutions in which the heat generated by the winding portion near the outer wall of the stator winding is dissipated through air cooling, the present application dissipates heat from the winding portion near the outer wall of the stator winding via the working medium flowing or stored in the inlet channel, thereby improving heat dissipation efficiency. Since the stator winding 122 is the primary heat source generated within the stator assembly 12, this facilitates improved heat dissipation efficiency for the stator assembly 12. Heat generated by the stator assembly 12 can be promptly dissipated to the exterior of the electric pump, laying a foundation for increasing the power density of the electric pump 100 and also for miniaturization of the electric pump 100. It is understood that timely dissipation of heat generated by the stator winding 122 can further improve the power density of the electric pump 100, making the stator core 1221 of the stator winding 122 more compact and thus laying a foundation for miniaturization of the electric pump 100. In this embodiment, the inner cavity 14 includes a rotor cavity 141 and an impeller cavity 142, and the inner cavity 14 can circulate the working medium. The winding 1223 near the central axis of the electric pump 100 can dissipate heat through the working medium flowing through the inner cavity 14. The portion of the winding 1223 away from the central axis of the electric pump 100, which is close to the outer wall of the stator winding, can dissipate heat through the working medium flowing or stored in the inlet channel because it is away from the working medium flowing in the inner cavity 14. Compared with the winding portion near the outer wall of the stator winding, which usually dissipates part of the heat through air cooling, this solution is conducive to improving the heat dissipation efficiency of the stator winding. In this way, it is more conducive to heat dissipation of high-power electric pumps.

[0044] As an implementation, please refer to Figures 1 to 10, an electric pump 100, the electric pump 100 includes a stator assembly 12, the stator assembly 12 includes a stator winding 122 and a stator housing 121, the stator housing 121 includes a first housing 1211 and a second housing 1212, the first housing 1211 is formed by at least inserting the stator winding 122, and a first assembly 25 is defined. The first assembly 25 includes the stator winding 122 and the first housing 1211, and the second housing 1212 is formed by at least inserting the first assembly 25. The electric pump 100 includes an inlet channel 23, and the wall forming the inlet channel 23 is at least Partially located in the second housing 1212, at least a portion of the inlet channel 23 extends along the axial direction of the electric pump 100. Along the radial direction of the electric pump 100, the inlet channel 23 is located radially outward of the first assembly 25. The electric pump 100 has an impeller chamber 142. The inlet channel 23 can store or flow working medium. One end of the inlet channel 23 is connected to the impeller chamber, and the other end of the inlet channel 23 is indirectly connected to the first return channel 20. When the electric pump 100 is operating, the pressure of the working medium at the connection between the impeller chamber 142 and the inlet channel 23 is greater than the pressure of the working medium at the connection between the impeller chamber 142 and the first return channel 20. In this way, while dissipating heat from the stator assembly, it is beneficial to reduce the impact of the electric pump on hydraulics.

[0045] Furthermore, the electric pump 100 includes a connecting chamber 16, a partition 13, a second housing 1212 including a bottom 1212d, the partition 13 and the bottom 1212d are sealed and fixed, the wall portion corresponding to the connecting chamber (16) includes a portion of the bottom 1212d and a portion of the partition 13, one end of the inlet channel 23 is connected to the impeller chamber 142, and the other end of the inlet channel 23 is connected to one end of the connecting chamber 16, the electric pump 100 includes a first return channel 20, the wall portion forming the first return channel 20 is located in the second housing 1212, one end of the first return channel 20 is connected to the connecting chamber 16, and the other end of the first return channel 20 is connected to the impeller chamber 142, when the electric pump 100 is working, the pressure of the working medium at the connection point between the impeller chamber 142 and the inlet channel 23 is greater than the pressure of the working medium at the connection point between the impeller chamber 142 and the first return channel 20. In this way, for an electric pump with a control board assembly, the above-mentioned heat dissipation path can be used to dissipate heat from the control board assembly.

[0046] It should be noted that the central axis of the electric pump 100 here and below is the extension direction of the shaft 18 of the electric pump 100, and the radial direction of the electric pump 100 is perpendicular to the axial direction of the electric pump 100.

[0047] Please refer to FIG. 1 to FIG. 10 , as an implementation method, the first component 25 is formed by insert injection molding with the stator winding 122 and the conductive member 271 .

[0048] As an implementation, referring to Figures 1 to 3 , a second housing 1212 is formed by injection molding using the first component 25 and the shaft 18 as inserts. The second housing 1212 has a portion of the inner cavity 14. Specifically, the second housing 1212 forms a rotor cavity 141. The shaft 18 includes a fixed portion 181 and an extension portion 182. The fixed portion 181 is injection-molded and fixed to the second housing 1212. The extension portion 182 extends within the inner cavity 14 along the axial direction of the electric pump 100. Specifically, the extension portion 182 extends within the rotor cavity 141. The rotating component 15 is loosely fitted with the extension portion 182, meaning that the rotating component 15 can rotate about the extension portion 182. The insert forming the second housing 1212 includes the shaft 18. In this manner, the second housing 1212 has the rotor cavity 141. That is, the wall portion corresponding to the rotor cavity 141 is formed during the second injection molding process, which helps reduce the interface between the first and second injection molding processes, thereby reducing the risk of leakage from the electric pump through this interface. Furthermore, the fixing portion 181 includes a first end portion 1811, which is completely embedded in the second housing 1212. In other words, the second housing 1212 covers the first end portion 1811. In this way, the risk of the working medium leaking through the wall portion corresponding to the rotor chamber 141 is further reduced.

[0049] Referring to Figures 1 to 7 , as one implementation, the second housing 1212 includes an outer peripheral sidewall portion 1212c. This outer peripheral sidewall portion 1212c is located radially outward of the outer portion 254 of the first assembly 25 in the radial direction of the electric pump 100. A portion of the inlet channel 23 extends within the outer peripheral sidewall portion 1212c in the axial direction of the electric pump 100. Disposing the inlet channel on the second housing in this manner facilitates simplifying the injection mold. Furthermore, the second housing 1212 includes a barrel portion 1212a, a radially extending portion 1212b, an outer peripheral sidewall portion 1212c, and a bottom portion 1212d. The radially extending portion 1212b is located on one side of the barrel portion 1212a along the axial direction of the electric pump 100. Specifically, the radially extending portion 1212b covers the upper end portion 251 of the first component 25, and the bottom portion 1212d is located on the other side of the barrel portion 1212a. The bottom portion 1212d covers a portion of the lower end portion 252 of the first component 25. Along the radial direction of the electric pump 100, the outer peripheral sidewall portion 1212c is provided. The peripheral sidewall portion 1212c is located radially outward from the outer portion 254 of the first assembly 25, and the cylindrical portion 1212a is located radially inward from the inner portion 253 of the first assembly 25. The electric pump 100 has a stator cavity 24, with a portion of the first assembly 25 located within the stator cavity 24. The wall portion corresponding to the stator cavity 24 includes the cylindrical portion 1212a, a radially extending portion 1212b, a portion of the peripheral sidewall portion 1212c, and a portion of the bottom portion 1212d. Along the axial direction of the electric pump 100, a portion of the inlet channel 23 extends within the peripheral sidewall portion 1212c. The wall portion corresponding to the rotor cavity 141 includes the cylindrical portion 1212a and a portion of the bottom portion 1212d. At least a portion of the rotor assembly 151 is located within the rotor cavity 141. The rotor cavity 141 and the impeller cavity 142 are connected to allow the flow of working medium. Along the radial direction of the electric pump 100, the rotor cavity 141 is located radially inward from the first assembly 25. The wall portion corresponding to the impeller chamber 142 includes a radially extending portion 1212b. In this manner, the upper end portion 251, inner portion 253, and outer portion 254 of the first assembly 25 are partially covered by the working medium flow path. The flow of the working medium facilitates dissipating heat generated by the stator winding 122 to the exterior of the electric pump 100. This increases the heat dissipation area of ​​the stator winding 122, thereby improving the heat dissipation efficiency of the stator winding 122 and, in turn, the stator assembly 12.

[0050] Further, referring to Figures 1 to 10 as an implementation, along the radial direction of the electric pump 100, the wall portion corresponding to the inlet channel 23 includes a first wall portion 231 and a second wall portion 232. Along the radial direction of the electric pump 100, the first wall portion 231 is farther away from the stator winding 122 relative to the second wall portion 232. The outer peripheral side wall portion 1212c includes an outer wall portion 1212e and an inner wall portion 1212f. Along the radial direction of the electric pump 100, the outer wall portion 1212e is farther away from the stator winding 122 relative to the inner wall portion 1212f. Along the radial direction of the electric pump 100, the second wall portion 232 is farther away from the stator winding 122 relative to the inner wall portion 1212f. In this way, the inlet channel 23 is completely located within the second housing 1212, which helps reduce the risk of leakage of the working medium within the inlet channel 23. Furthermore, along the radial direction of the electric pump 100 , the first wall portion 231 is closer to the stator winding than the outer wall portion 1212 e .

[0051] Please refer to Figures 1 to 20. To further simplify the structure of the electric pump 100, the working medium entering the inlet channel 23 can be drawn from the working medium in the inner cavity of the electric pump 100. As an implementation, the electric pump 100 has an inner cavity 14, which includes an impeller cavity 142. The electric pump 100 includes a rotating assembly 15, which includes an impeller assembly 152. The impeller assembly 152 is located in the impeller cavity 142, and one end of the inlet channel 23 is connected to the impeller cavity 142. In this way, the working medium flowing in the inner cavity of the electric pump 100 can be drawn from the working medium to enter the inlet channel 23, which helps to simplify the structure of the electric pump 100 while dissipating heat from the stator assembly 12.

[0052] As one implementation, referring to Figures 1 to 20 , the electric pump includes a connecting cavity 16. The electric pump 100 includes a partition 13, which is sealed and fixed to the bottom 1212d. The wall portion corresponding to the connecting cavity 16 includes a portion of the bottom 1212d and a portion of the partition 13. The other end of the inlet channel 23 is connected to one end of the connecting cavity 16. In this manner, the lower end 252 of the first component 25 is partially covered by the connecting cavity 16, which helps increase the heat dissipation area of ​​the stator winding 122 and thereby improves the heat dissipation efficiency of the stator assembly 12.

[0053] As an implementation, referring to Figures 1 to 13 , the electric pump 100 includes a bottom housing 26, which includes a support portion 261. The support portion 261 includes a first sub-portion 2611 and a second sub-portion 2612. The first sub-portion 2611 and the second sub-portion 2612 are integrally formed. The second sub-portion 2612 is a partition 13. The first sub-portion 2611 is fixedly connected to the second housing 1212 of the stator assembly 12, and the partition 13 is sealed and fixedly connected to the stator assembly 12. Specifically, the second sub-portion 2612 is welded to the second housing 1212. Welding methods include, but are not limited to, infrared welding, rotary friction welding, laser welding, and ultrasonic welding.

[0054] Furthermore, as an implementation, referring to Figures 1 to 13 , the electric pump 100 includes a conductive portion 27 , which includes a connector 272 for electrically connecting to an external power source. The support portion 261 is formed by insert-molding at least with the connector 272. This approach facilitates, firstly, axial miniaturization of the electric pump 100. Secondly, by separating the bottom shell and stator assembly, the injection mold for the stator assembly is simplified.

[0055] As another implementation method, please refer to Figures 1, 14 and 15. The electric pump 100 includes a bottom shell 26, and the bottom shell 26 includes a first sub-section 2611'. The first sub-section 2611' and the stator assembly 12 are an integral structural part, that is, the second shell 1212 and the first sub-section 2611' are an integral structural part, and the partition 13 and the first sub-section 2611' are split structural parts. The partition 13 and the stator assembly 12 are sealed and fixedly connected. Specifically, the partition 13 is welded and fixed to the stator assembly 12, and the welding method includes but is not limited to infrared welding, rotary friction welding, laser welding and ultrasonic welding. Of course, the sealed and fixed connection method of the partition 13 and the stator assembly 12 can also include other methods, such as a method of combining a fixing part and a sealing part, the fixing part includes but is not limited to bolts, and the sealing part includes but is not limited to a sealing ring. It should be noted that the sealed fixed connection here means that after the partition 13 is connected to the stator assembly 12, the working medium in the communicating cavity is sealed in the communicating cavity and will not leak out or flow out to the outside of the communicating cavity.

[0056] To further accelerate heat dissipation from the stator assembly 12 and improve its heat dissipation efficiency, as shown in Figures 1, 2, and 16, as one implementation, the inner chamber 14 includes a rotor chamber 141, which communicates with the impeller chamber 142. The electric pump 100 has a through-channel 17 extending axially through the bottom 1212d of the electric pump 100. One end of the through-channel 17 communicates with the rotor chamber 141, and the other end communicates with the connecting chamber 16. This accelerates the flow of the working medium within the inlet channel 23 and the circulation of the working medium within the inlet channel 23 and the connecting chamber 16, thereby improving the heat dissipation efficiency of the stator winding 122. The heat dissipation path herein is defined as the first heat dissipation path S1. The working medium in the first heat dissipation path S1 flows in the direction from the impeller chamber 142 to the inlet channel 23 to the connecting chamber 16 to the through-channel 17 to the rotor chamber 141.

[0057] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figures 1, 2, and 17. As an implementation method, the electric pump 100 includes a second return channel 20', and the electric pump 100 includes a rotor assembly 151. The rotor assembly 151 is fixedly connected to the impeller assembly 152. Specifically, the rotor assembly 151 and the impeller assembly 152 are injection-molded and fixed. At least a portion of the rotor assembly 151 is located in the rotor cavity 141, and at least a portion of the second return channel 20' is provided in the rotor assembly 151. The electric pump 100 has an inlet 111 for the inflow of the working medium. One end of the second return channel 20' is connected to the rotor cavity 141, and the other end of the second return channel 20' is connected to the inlet 111. In this manner, the working medium within the inlet channel 23 and the connecting cavity 16 can enter the rotor cavity 141. The working medium within the rotor cavity 141 can then enter the inlet 111 through the second return channel 20'. This heat dissipation path is defined as the second heat dissipation path S2. The flow direction of the working medium in the second heat dissipation path S2 is from the impeller cavity 142 -> inlet channel 23 -> connecting cavity 16 -> through channel 17 -> rotor cavity 141 -> second return channel 20' -> inlet 111. First, due to the greater pressure difference between the impeller cavity 142 and the inlet 111, the flow velocity of the working medium in the second heat dissipation path S2 is faster, which is beneficial for improving the heat dissipation efficiency of the stator assembly 12. Second, it can be seen that this embodiment has both the first heat dissipation path S1 and the second heat dissipation path S2. The increase in heat dissipation paths can also improve the heat dissipation efficiency of the stator assembly 12.

[0058] To ensure the output efficiency of the electric pump, the effective flow area of ​​the through-channel is usually not too large. When the electric pump is working, impurities may exist in the working medium. In order to reduce the blockage of the through-channel and affect the heat dissipation of the stator assembly, as another implementation method, please refer to Figures 1 to 3 and Figure 18. The impeller chamber 142 includes a volute chamber 1421 and a non-volute chamber 1422. When the electric pump 100 is working, the pressure of the working medium in the volute chamber 1421 is greater than the pressure of the working medium in the non-volute chamber 1422. One end of the inlet channel 23 is connected to the volute chamber 1421. The electric pump 100 includes a first return channel 20. The wall portion forming the first return channel 20 is located on the second housing 1212. At least a portion of the first return channel 20 is in the axial direction of the electric pump 100. One end of the first return channel 20 is connected to the connecting chamber 16, and the other end of the first return channel 20 is connected to the non-volute chamber 1422. Define the third heat dissipation path S3. The direction of flow of the working medium in the third heat dissipation path S3 is -> the volute cavity of the impeller cavity -> the inlet channel -> the connecting cavity -> the first return channel -> the non-volute cavity 1422 of the impeller cavity. In this way, first, the through-channel 17 can be omitted, reducing the risk of blockage of the through-channel 17. Second, in this way, the pressure drop of the working medium flowing in the volute cavity 1421 and the non-volute cavity 1422 is smaller than the pressure drop between the impeller cavity 142 and the inlet 111. Without affecting the efficiency of the electric pump, the effective flow area of ​​the return channel 20 can be designed to be larger, which is conducive to reducing the risk of blockage of the third heat dissipation path S3. It should be noted that when the electric pump is working, the working medium in the impeller cavity will partially leave the electric pump through the outlet 112 along the volute cavity 1421 due to the rotation of the impeller assembly.

[0059] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figures 1 to 3. As an implementation method, the electric pump 100 includes a second return channel 20', and the electric pump 100 includes a rotor assembly 151. The rotor assembly 151 is fixedly connected to the impeller assembly 152. Specifically, the rotor assembly 151 and the impeller assembly 152 are injection-molded and fixed. At least a portion of the rotor assembly 151 is located in the rotor cavity 141, and at least a portion of the second return channel 20' is provided in the rotor assembly 151. The electric pump 100 has an inlet 111 for the inflow of the working medium. One end of the second return channel 20' is connected to the rotor cavity 141, and the other end of the second return channel 20' is connected to the inlet 111. In this manner, the working medium within the rotor cavity 141 can enter the inlet 111 through the second return channel 20'. This heat dissipation path is defined as the fourth heat dissipation path S4. The working medium in the fourth heat dissipation path S4 flows in the direction from the impeller cavity 142 -> rotor cavity 141 -> second return channel 20' -> inlet 111. First, due to the greater pressure difference between the impeller cavity 142 and the inlet 111, the working medium in the fourth heat dissipation path S4 flows faster, which helps improve the heat dissipation efficiency of the stator assembly 12. Second, it can be seen that this embodiment has both the first heat dissipation path S3 and the fourth heat dissipation path S4. The addition of heat dissipation paths can also improve the heat dissipation efficiency of the stator assembly 12.

[0060] As an implementation method, please refer to Figures 1 to 20. The electric pump 100 includes a conductive portion 27, the stator winding 122 includes a winding 1223, one end of the conductive portion 27 is electrically connected to the winding 1223, the bottom 1212d includes a front bottom surface 1212g and a reverse bottom surface 1212h, the front bottom surface 1212g is close to the partition 13 relative to the reverse bottom surface 1212h, the partition 13 is sealed and fixed to the front bottom surface 1212g, specifically, the partition 13 is sealed and fixed to the covering surface 1212m, the front bottom surface 1212g includes the covering surface 1212m and the opening The portion of the bottom surface 1212g covered by the partition 13 is defined as the covered surface 1212m, and the portion not covered by the partition 13 is defined as the open surface 1212n. A first reference plane 101 is defined, and the first reference plane 101 is perpendicular to the axial direction of the electric pump 100. The covered surface 1212m, the open surface 1212n, and the portion where the conductive member 271 connects to the winding 1223 are orthographically projected onto the first reference plane 101. The portion where the conductive member 271 connects to the winding 1223 is located within the projected area of ​​the open surface 1212n. In this manner, the conductive portion can be located in a dry area outside the connecting cavity 16, reducing the number of structures required to protect the conductive portion 27 and simplifying the electric pump structural design. For ease of illustration, the projected areas of the covered surface 1212m and the open surface 1212n are represented by different hatching in FIG. 19.

[0061] As an implementation method, please refer to Figures 1 to 20. The electric pump 100 includes a control board assembly 22, which is electrically connected to the stator winding 122. The control board assembly 22 is in direct contact with the partition 13 or a heat-conducting portion 19 is filled between the control board assembly 22 and the partition 13. Figure 3 only shows an implementation method in which the heat-conducting portion 19 is filled between the control board assembly 22 and the partition 13. The implementation method in which the control board assembly 22 is in direct contact with the partition 13 is not shown. Specifically, the heat-conducting portion 19 includes thermally conductive silica gel or thermally conductive silicone grease. In this way, it is beneficial to dissipate heat from the control board assembly 22, thereby improving the life of the electric pump. In this embodiment, the electric pump 100 includes an end cover 21, which is fixedly connected to the bottom shell 26. Specifically, the end cover 21 is welded to the bottom shell 26, and the welding methods include but are not limited to infrared welding, rotary friction welding, laser welding and ultrasonic welding. The electric pump 100 includes a control chamber 28. The wall portion corresponding to the control chamber 28 includes an end cap 21 and a bottom shell 26. The control board assembly 22 is located in the control chamber 28. In this manner, the control chamber 28 and the stator chamber 24 are not connected. This helps reduce the heat generated by the stator winding 122 from being transferred to the control board assembly 22 in the control chamber 28, thereby improving the life of the control board assembly 22.

[0062] During the operation of the electric pump, the control board assembly will generate a certain amount of heat. If this heat cannot be dissipated in time, it will affect the life of the control board assembly.

[0063] As an implementation method, please refer to Figures 1 to 24. The electric pump 100 includes a control board assembly 22 and a stator assembly 12. The stator assembly 12 includes a stator winding 122 and a stator housing 121. The stator housing 121 is formed by at least insert injection molding with the stator winding 122 as an insert. The stator housing 121 includes a bottom 1212d. The electric pump 100 includes a partition 13. Along the axial direction of the electric pump 100, the partition 13 is away from the stator winding 122 relative to the bottom 1212d. The bottom 1212d is sealed with the partition 13. The bottom 1212d includes a front bottom surface 1212g and a back bottom surface 1212h. Along the axial direction of the electric pump 100, the front bottom surface 1212g is away from the stator winding 122 relative to the back bottom surface 1212h. Specifically, the electric pump 100 includes a rotor cavity 141. The wall corresponding to the rotor cavity 141 includes a portion of the back bottom surface 1212h. The partition 13 includes a contact wall 131 and a connecting wall 132. Along the axial direction of the electric pump 100, the contact wall 131 is located closer to the bottom surface 1212g than the connecting wall 132. The electric pump 100 has a connecting cavity 16 capable of flowing or storing a working medium. The wall portion corresponding to the connecting cavity 16 includes a portion of the bottom surface 1212g and a portion of the contact wall 131. The control board assembly 22 is in direct contact with the connecting wall 132, or a heat conducting portion 19 is filled between the connecting wall and the control board assembly 22. It should be noted that the aforementioned "sealed arrangement" means that the working medium within the connecting cavity 16 will not leak out of the connecting cavity 16 through the interface between the bottom 1212d and the partition 13. Here and below, the "axial direction of the electric pump" refers to the direction in which the axis of the electric pump extends. The radial direction of the electric pump 100 is perpendicular to the axial direction of the electric pump. In this manner, first, heat generated by the control board assembly can be transferred to the working medium in the connecting cavity, thereby facilitating heat dissipation from the control board assembly and, in turn, improving the service life of the electric pump. Second, since the stator housing is made of injection molding material, compared with the technical solution in which the control board assembly is in direct contact with the bottom of the stator housing, it is beneficial to improve the heat dissipation efficiency of the control board assembly.

[0064] As an implementation method, please refer to Figures 1, 21, 23, and 24. The control board assembly 22 includes a substrate 221 and electronic components 222. The substrate 221 includes a front side 2211 and a back side 2212. Along the axial direction of the electric pump 100, the front side 2211 is closer to the partition 13 than the back side 2212. The electronic components 222 are arranged on the back side 2212. At least the front side 2211 is in direct contact with the partition 13, or at least a portion of the front side 2211 and the partition 13 are filled with a heat-conducting portion. The heat-conducting portion 19 includes but is not limited to thermally conductive silica gel or thermally conductive silicone grease. In this way, it is beneficial to dissipate heat from the control board assembly 22. Figure 23 only shows an embodiment in which at least the front side 2211 is in direct contact with the partition 13. The embodiment in which at least a portion of the front side 2211 and the partition 13 are filled with a heat-conducting portion 19 is not shown in the figure.

[0065] As another implementation, referring to Figures 1 to 3, 21, and 23, the control board assembly 22 includes a substrate 221 and electronic components 222. The substrate 221 includes a front surface 2211 and a back surface 2212. Along the axial direction of the electric pump 100, the front surface 2211 is closer to the partition 13 than the back surface 2212. A gap is formed between the front surface 2211 and the partition 13. At least part of the electronic components 222 are arranged between the front surface 2211 and the partition 13. The space between the front surface 2211 and the partition 13 is filled with a heat conducting portion 19. The heat conducting portion 19 includes, but is not limited to, thermally conductive silicone or thermally conductive silicone grease. In this way, heat dissipation of some electronic components arranged on the front surface of the substrate can be accelerated.

[0066] Further, referring to Figures 1 to 3, Figure 21, and Figure 23, the electronic components 222 include heat-generating electronic components 2221, at least some of the heat-generating electronic components 2221 are arranged on the front surface 2211 of the substrate 221, at least some of the heat-generating electronic components 2221 are in direct contact with the partition 13, or at least some of the heat-generating electronic components 2221 and the partition 13 are filled with a heat-conducting portion 19. The heat-generating electronic components 2221 can be arranged on the front surface 2211, which can speed up the heat dissipation of the heat-generating electronic components 2221, which is beneficial to improving the life of the control board assembly. In this embodiment, the heat-generating electronic components include common heat-generating electronic components such as diodes, MOS tubes, inductors, resistors, and capacitors.

[0067] Please refer to Figures 1 to 24. In order to increase the area of ​​the connecting cavity 16 along the radial direction of the electric pump 100, and thereby increase the heat dissipation area of ​​the control board assembly 22, as an implementation method, the wall portion corresponding to the connecting cavity 16 includes a circumferential side portion 161, and a first reference plane 101 is defined. The first reference plane 101 is a plane parallel to the bottom surface 1212g of the bottom 1212d. The circumferential side portion 161 includes a first circumferential side portion 1611 and a second circumferential side portion 1612. The first circumferential side portion 1611 and the second circumferential side portion 1612 are arranged opposite to each other. The first circumferential side portion 1611, the second circumferential side portion 1612, and the stator winding 122 are projected onto the first reference plane 101. Along the radial direction of the electric pump 100, the projection contour line L1 of the first circumferential side portion 1611 and the projection contour line L2 of the second circumferential side portion 1612 are located radially outside the projection contour line L5 of the outer portion of the stator winding 122. It should be noted that the "radial direction of the electric pump" is perpendicular to the "axial direction of the electric pump". In this way, first, it is beneficial to increase the area of ​​the connecting cavity along the radial direction of the electric pump, which is beneficial to improving the heat dissipation efficiency of the control board assembly. Second, the area of ​​the connecting cavity along the radial direction of the electric pump is increased, which is beneficial to increase the layout space of the heat-generating electronic components. At the same time, the selection space of electronic components is increased. For example, lower-cost electronic components can be selected, laying a certain foundation for reducing the cost of the electric pump. Specifically, the first circumferential side portion and the second circumferential side portion can all be protruded from the bottom surface of the bottom; the first circumferential side portion and the second circumferential side portion can all be protruded from the contact wall; of course, the first circumferential side portion and the second circumferential side portion can also partially protrude from the bottom surface, and the other part of the first circumferential side portion and the second circumferential side portion protrudes from the contact wall. In this embodiment, the first circumferential side 1611 includes a first sub-circumferential side portion 1611a and a second sub-circumferential side portion 1611b, and the second circumferential side portion 1612 includes a third sub-circumferential side portion 1612a and a fourth sub-circumferential side portion 1612b. The first and third sub-circumferential side portions 1611a and 1612a protrude from the bottom surface 1212g, while the second and fourth sub-circumferential side portions 1611b and 1612b protrude from the contact wall 131. The first and third sub-circumferential side portions 1611a and 1612a are welded and sealed, while the second and fourth sub-circumferential side portions 1611b and 1612b are welded and sealed. Welding methods include, but are not limited to, laser welding, infrared welding, ultrasonic welding, and rotary friction welding. This method further facilitates the processing and manufacturing of the circumferential side portions.

[0068] Further, please refer to Figures 1 to 24. As an implementation method, the circumferential side portion 161 includes a third circumferential side portion 1613 and a fourth circumferential side portion 1614. The third circumferential side portion 1613 and the fourth circumferential side portion 1614 are arranged opposite to each other. The first circumferential side portion 1611 and the second circumferential side portion 1612 are connected through the third circumferential side portion 1613 and the fourth circumferential side portion 1614. The third circumferential side portion 1613, the fourth circumferential side portion 1614 and the stator winding 122 are projected onto the first reference plane 101. Along the radial direction of the electric pump 100, the projection contour line L3 of part of the third circumferential side portion 1613 and the projection contour line L4 of part of the fourth circumferential side portion 1614 are located radially inside the projection contour line L5 of the outer part of the stator winding 122. In this manner, other components can be arranged in the area between the third and fourth circumferential sides 1613, 1614, and the outer portion of the stator winding 122. For example, along the circumferential direction of the electric pump 100, a portion of the conductive member 271 is arranged in the area between the third and fourth circumferential sides 1613, 1614, and the outer portion of the stator winding 122. This facilitates the simplification of the structure of the electric pump 100 and lays a foundation for miniaturization of the electric pump 100. Specifically, the third and fourth circumferential sides 1613, 1614 can be arranged to protrude entirely from the bottom surface 1212g of the bottom portion 1212d; the third and fourth circumferential sides 1613, 1614 can also be arranged to protrude entirely from the contact wall 131. Alternatively, the third and fourth circumferential sides 1613, 1614 can partially protrude from the bottom surface 1212g, while other portions of the third and fourth circumferential sides 1613, 1614 protrude from the contact wall 131. In this embodiment, the third circumferential side portion 1613 includes a fifth sub-circumferential side portion 1613a and a sixth sub-circumferential side portion 1613b, and the fourth circumferential side portion 1614 includes a seventh sub-circumferential side portion 1614a and an eighth sub-circumferential side portion 1614b; the fifth sub-circumferential side portion 1613a and the seventh sub-circumferential side portion 1614a protrude from the bottom surface 1212g, and the sixth sub-circumferential side portion 1613b and the eighth sub-circumferential side portion 1614b protrude from the contact wall 131, and the fifth sub-circumferential side portion 1613a and the sixth sub-circumferential side portion 1613b are sealed and fixed; the seventh sub-circumferential side portion 1614a and the eighth sub-circumferential side portion 1614b are sealed and fixed. Specifically, the fifth sub-circumferential side portion 1613a and the sixth sub-circumferential side portion 1613b are welded and sealed and fixed; the seventh sub-circumferential side portion 1614a and the eighth sub-circumferential side portion 1614b are welded and sealed and fixed, and the welding methods include but are not limited to laser welding, infrared welding, ultrasonic welding and rotary friction welding. In this way, the shaping of the peripheral side portion is more favorable.

[0069] Referring to Figures 1 to 24 , the stator housing 121 includes a first housing 1211 and a second housing 1212. The first housing 1211 is formed by insert-molding at least with the stator winding 122. In this embodiment, the first housing 1211 is formed by insert-molding the stator winding 122 and the conductive member 271. A first component 25 is defined. The first component 25 includes the stator winding 122 and the first housing 1211. The second housing 1212 is formed by injection molding at least with the first component 25. The second housing 1212 includes a bottom 1212d and a barrel 1212a. Along the axial direction of the electric pump 100, the bottom 1212d is located on one side of the barrel 1212a. The electric pump 100 has a rotor cavity 141. The wall portion corresponding to the rotor cavity 141 includes the barrel 1212a and a portion of the bottom 1212d. Specifically, the bottom 1212d includes a reverse bottom surface 1212h. Along the axial direction of the electric pump 100, the positive bottom surface 1212g is away from the stator winding 122 relative to the reverse bottom surface 1212h. The wall portion corresponding to the rotor cavity 141 includes the cylindrical portion 1212a and part of the reverse bottom surface 1212h. The part of the reverse bottom surface 1212h of the wall portion forming the rotor cavity 141 is defined as the bottom surface 1411. Along the radial direction of the electric pump 100, the area of ​​the connecting cavity 16 is larger than the area of ​​the bottom surface 1411. The working medium flowing within rotor cavity 141 can dissipate heat from the portion of the first assembly near inner portion 253. The connecting cavity 16 is positioned near the lower end 252 of the first assembly 25, and its area is larger than the area of ​​bottom surface 1411. This facilitates heat dissipation from the first assembly 25 near the lower end 252. This facilitates heat dissipation from the control board assembly 22 while also increasing the heat dissipation area of ​​the stator assembly 12, thereby further facilitating heat dissipation from the stator assembly 12. Third, along the radial direction of the electric pump 100, the area of ​​the connecting cavity 16 is larger than the area of ​​bottom surface 1411, which facilitates increasing the heat dissipation area of ​​the control board assembly and improving its heat dissipation efficiency.

[0070] Furthermore, as an implementation method, please refer to Figures 1 to 23, the electric pump 100 includes a conductive part 27, the conductive part 27 includes a connector 272, the connector 272 is used to electrically connect to an external power supply, and the support part 261 is formed by at least insert injection molding with the connector 272. In this way, it is beneficial to the miniaturization of the electric pump 100 in the axial direction.

[0071] As an implementation method, please refer to Figures 1 to 13. The electric pump 100 includes a bottom shell 26, and the bottom shell 26 includes a support portion 261. The support portion 261 includes a first sub-portion 2611 and a second sub-portion 2612. The first sub-portion 2611 and the second sub-portion 2612 are an integral structural member. The second sub-portion 2612 is a partition 13. The first sub-portion 2611 is fixedly connected to the stator assembly 12 and the second shell 1212. The partition 13 is sealed and fixedly connected to the stator assembly 12. Specifically, the second sub-portion 2612 is welded and fixed to the second shell 1212. The welding method includes but is not limited to infrared welding, rotary friction welding, laser welding and ultrasonic welding. In this embodiment, the electric pump 100 includes an end cover 21. The end cover 21 is fixedly connected to the bottom shell 26. Specifically, the end cover 21 is welded and fixed to the bottom shell 26. The welding method includes but is not limited to infrared welding, rotary friction welding, laser welding and ultrasonic welding. The electric pump 100 includes a control chamber, the walls of which include an end cap and a bottom shell. The control board assembly 12 is located within the control chamber 28. This arrangement isolates the control chamber 28 from the stator chamber 24, thereby reducing heat transfer from the stator windings 122 to the control board assembly 22 within the control chamber 28 and improving the life of the control board assembly 22.

[0072] As another implementation method, please refer to Figures 1, 14 and 15. The electric pump 100 includes a bottom shell 26, and the bottom shell 26 includes a first sub-section 2611'. The first sub-section 2611' and the stator assembly 12 are an integral structural part, that is, the second shell 1212 and the first sub-section 2611' are an integral structural part, and the partition 13 and the first sub-section 2611' are split structural parts. The partition 13 and the stator assembly 12 are sealed and fixedly connected. Specifically, the partition 13 is welded and fixed to the stator assembly 12, and the welding method includes but is not limited to infrared welding, rotary friction welding, laser welding and ultrasonic welding. Of course, the sealed and fixed connection method of the partition 13 and the stator assembly 12 can also include other methods, such as a method of combining a fixing part and a sealing part, the fixing part includes but is not limited to bolts, and the sealing part includes but is not limited to a sealing ring. It should be noted that the sealed fixed connection here means that after the partition 13 is connected to the stator assembly 12, the working medium in the communicating cavity is sealed in the communicating cavity and will not leak out or flow out to the outside of the communicating cavity.

[0073] As an implementation method, please refer to Figures 1 to 24, the electric pump 100 includes a conductive part 19, the stator winding 122 includes a winding 1223, one end of the conductive part 19 is electrically connected to the winding 1223, the bottom 1212d includes a front bottom surface 1212g and a reverse bottom surface 1212h, the front bottom surface 1212g is close to the partition 13 relative to the reverse bottom surface 1212h, the partition 13 is sealed and fixed to the front bottom surface 1212g, the front bottom surface 1212g includes a covering surface 1212m and an open surface 1212n, the part of the front bottom surface 1212g covered by the partition 13 is defined as the covering surface 1212m, and the part not covered by the partition 13 is defined as the open surface 1212n, specifically, the partition 13 is sealed and fixed to the covering surface 1212m. Define a first reference plane 101, which is perpendicular to the axial direction of the electric pump 100. Project the covered surface 1212m, the open surface 1212n, and the connection between the conductive member 271 and the winding 1223 onto the first reference plane 101. The connection between the conductive member 271 and the winding 1223 is located within the projection of the open surface 1212n. This allows the conductive portion to be located in a dry area outside the communication cavity, reducing the need for protective structures and simplifying the electric pump design. For ease of illustration, the projections of the covered surface 1212m and the open surface 1212n are depicted with different hatching in Figure 21.

[0074] As an implementation, referring to Figures 1 to 28 , an electric pump 100 includes a stator winding 122 and a stator housing 121. The stator housing 121 is formed by injection molding with at least the stator winding 122 as an insert. The electric pump 100 includes a bottom shell 26 and a connector 272. The bottom shell 26 is formed by injection molding with at least the connector 272 as an insert. The bottom shell 26 is fixedly connected to the stator housing 121. The bottom shell 26 is provided separately from the stator housing 121. The connector 272 is fixedly fixedly fixedly connected to the bottom shell 26 by injection molding. Compared to a technical solution in which the stator winding 122 and the connector 272 are formed as inserts to form the stator housing 121, and the connector 272 is fixedly fixedly fixedly connected to the stator housing 121 by injection molding, the present application reduces the number of injection molded inserts when injecting and fixing the connector 272, which helps simplify the injection mold and thereby helps reduce the production cost of the electric pump.

[0075] As one implementation, referring to Figures 1 to 28 , the bottom housing 26 includes a support portion 261, which is formed by insert molding with at least a connector 272. The connector 272 includes a first electrical connection segment 2721, an injection-molded segment 2722, and a power connection segment 2723. The first electrical connection segment 2721 is electrically connected to the stator winding 122 and is located at one end of the injection-molded segment 2722. The power connection segment 2723 is located at the other end of the injection-molded segment 2722 and is used to electrically connect to an external power source. The injection-molded segment 2722 is embedded in the support portion 261. This arrangement facilitates reliable connection of the connector 272. Furthermore, the first electrical connection segment 2721 and the power connection segment 2723 serve as positioning elements when the connector 272 is fixed to the support portion 261 by injection molding, thereby improving the manufacturability of the bottom housing 26.

[0076] Furthermore, as an implementation, referring to Figures 1 to 26 , the first electrical connection section 2721 can be directly electrically connected to the stator winding 122, or alternatively, electrically connected via a control board assembly or adapter board assembly 22. This allows the electric pump to adapt to different design requirements, for example, to an electric pump with a controller, or to an electric pump without a controller. In this embodiment, the first electrical connection section 2721 is electrically connected to the stator winding 122 via the control board assembly 22. Specifically, the electric pump 100 includes a control board assembly or adapter board assembly 22, and the first electrical connection section 2721 of the connector 272 is electrically connected to the control board assembly or adapter board assembly 22. In this embodiment, the first electrical connection section 2721 of the connector 272 is electrically connected to the control board assembly 22. Specifically, the first electrical connection section 2721 plugs into the control board assembly 22 to achieve electrical connection. The electric pump 100 includes a conductive member 271 , one end of which is electrically connected to the stator winding 122 , and the other end of which is electrically connected to the control board assembly or the adapter board assembly 22 .

[0077] Specifically, as one implementation, as shown in Figures 1 to 26 , the control board assembly 22 includes a substrate and electronic components. When powered, the control board assembly can control the electric pump. As another implementation, as shown in Figure 27 , the electric pump 100 includes an adapter plate assembly. The adapter plate assembly includes an adapter plate having an internal circuit. The first electrical connection section 2721 is electrically connected to the stator winding 122 via the circuit within the adapter plate assembly. Alternatively, the adapter plate assembly may include an injection molded body and a conductor portion, with the conductor portion being an insert in the injection molded body.

[0078] As an implementation, referring to Figures 1 to 28 , the bottom housing 26 has a receptacle 263. The other end of a conductive member 271 extends within the receptacle 263 along the axial direction of the electric pump 100. The other end of the conductive member 271 is electrically connected to the control board assembly or adapter board assembly 22. In this embodiment, the other end of the conductive member 271 is electrically connected to the control board assembly 22.

[0079] As a specific embodiment, referring to Figures 1 to 26 , along the axial direction of the electric pump 100, the first electrical connection section 2721 extends from the support portion 261 in a direction away from the stator winding 122. Along the radial direction of the electric pump 100, the power connection section 2733 is located radially outward of the first electrical connection section 2721. The power connection section 2723 extends from the support portion 261 in a direction away from the stator winding 122. Along the axial direction of the electric pump 100, the control board assembly or adapter board assembly 22 is away from the stator winding 122 relative to at least a portion of the injection molding section 2722. This method facilitates simplifying the manufacturing steps of the connector 272. For example, the connector 272 of this structure can be formed by stamping in a single step before injection molding. Second, the power connection section 2723 extends from the supporting portion in a direction away from the stator winding 122. In this way, that is, along the axial direction of the electric pump 100, the power connection section 2723 extends in a direction away from the pump cover 11. In this way, the interference with the matching components of the electric pump, such as the flow channel plate, is reduced, and it is more convenient for the external power supply part to be plugged into the power connection section 2723 to achieve electrical connection.

[0080] As another implementation method, the electric pump 100 can adapt to the design of an uncontrolled water pump. Specifically, please refer to Figures 1 to 27 and 28. The bottom shell 26 includes a support portion 261, and the support portion 261 is formed by at least injecting a connector 272 as an insert. The connector 272 includes an injection section 2722 and a power connection section 2723. The injection section 2722 and the power connection section 2723 are an integral structural member or the injection section 2722 and the power connection section 2723 are fixedly connected to achieve injection. The injection molding section 2722 is electrically connected to the power connection section 2723, which is used to electrically connect to an external power source. At least a portion of the injection molding section 2722 is embedded in the support portion 261. The connector 272 has an inner hole 273. The electric pump 100 includes a conductive member 271. One end of the conductive member 271 is electrically connected to the stator winding 122. The other end of the conductive member 271 is limitedly engaged with the wall corresponding to the inner hole 273, and the other end of the conductive member 271 is electrically connected to the injection molding section 2722. In this way, the structure of the uncontrolled electric pump is simpler and easier to install on the bottom shell.

[0081] The stator housing 121 can be formed by insert molding with the stator winding 122, and one end of the conductive member 271 is electrically connected to the stator winding 122. Specifically, the conductive member 271 can pierce the windings of the stator winding 122 to achieve electrical connection. Of course, as another embodiment, the stator housing 121 can be formed by insert molding with the stator winding and the conductive member 271, and one end of the conductive member 271 is electrically connected to the stator winding 122, and one end of the conductive member 271 is located within the stator housing 121. In this way, while achieving electrical connection between the conductive member 271 and the stator winding, it is also beneficial to fix the conductive member 271, making it more convenient for the turnover and transportation of the electric pump during the manufacturing process.

[0082] Please refer to Figures 1 to 26. The electric pump 100 includes an end cover 21, and the electric pump 100 also includes a cover portion 262. The cover portion 262 and the end cover 21 can be an integral structural member. Of course, the cover portion 262 can also form an integral structural member with the support portion 261. In this embodiment, as an implementation method, the bottom shell 26 also includes a cover portion 262. The cover portion 262 and the support portion 261 are an integral structural member. The electric pump 100 has a control chamber 28. The wall portion corresponding to the control chamber 28 includes part of the support portion 261 and the cover portion 262. The end cover 21 is fixedly connected to the bottom shell 26. Specifically, the end cover 21 is fixed to the bottom shell 26 by welding. The welding methods include but are not limited to laser welding, infrared welding, ultrasonic welding, and rotary friction welding.

[0083] Furthermore, as one implementation, referring to Figures 1 to 26 , the electric pump 100 includes a control board assembly or adapter board assembly 22, which is located in a control cavity 28. Specifically, the end cap 21 is secured to the bottom shell 26 to form the control cavity 28. A first electrical connection section 2721 is electrically connected to the stator winding 122 via the control board assembly or adapter board assembly 22. Specifically, as one implementation, the control board assembly 22 includes a substrate and electronic components. When powered, the control board assembly can control the electric pump. As another implementation, referring to Figure 27 , the electric pump includes an adapter board assembly, which includes an adapter board having internal circuitry. The first electrical connection section is electrically connected to the stator winding via the circuitry within the adapter board assembly. Alternatively, the adapter board assembly may include an injection molded body and a conductor portion, with the conductor portion being an insert in the injection molded body. The first electrical connection section is electrically connected to one end of the conductor portion, and the power connection section is electrically connected to the other end of the conductor portion. The control board assembly or the connecting board assembly 22 is placed in a separate chamber, which helps to reduce the heat generated by other components and transfer it to the control chamber 28 , thereby helping to increase the service life of the control board assembly 22 .

[0084] As an implementation, referring to Figures 1 to 28 , the stator housing 121 includes a first housing 1211 and a second housing 1212. The first housing 1211 is formed by injection molding with at least the stator winding 122 as an insert, defining a first assembly 25. The first assembly 25 includes the stator winding 122 and the first housing 1211. The second housing 1212 is formed by injection molding with at least the first assembly 25. The second housing 1212 includes a bottom 1212d, which is fixedly connected to the bottom shell 26 along the axial direction of the electric pump 100. Specifically, the second housing 1212 includes a bottom 1212d and a barrel 1212a. The bottom 1212d is located on one side of the barrel 1212a along the axial direction of the electric pump 100. The electric pump 100 has a rotor cavity 141. The wall portion corresponding to the rotor cavity 141 includes the barrel 1212a and a portion of the bottom 1212d. The bottom 1212d is fixedly connected to the bottom shell 26. This method is helpful to simplify the injection mold during the injection molding of the stator housing 121 .

[0085] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present application with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. An electric pump (100), characterized in that: The electric pump (100) includes a stator assembly (12), the stator assembly (12) includes a stator winding (122) and a stator housing (121), the stator housing (121) includes a first housing (1211) and a second housing (1212), the first housing (1211) is injection-molded at least with the stator winding (122) as an insert to define a first assembly (25), the first assembly (25) includes the stator winding (122) and the first housing (1211), the second housing (1212) is injection-molded at least with the first assembly (25) as an insert, the electric pump (100) has an impeller chamber (142), the electric pump (100) includes a first return channel (20), and at least part of the wall forming the first return channel (20) is located in the second housing (1212), the first return channel (20) communicates with the impeller chamber (142), and the first return channel (20) provides a path for the working medium to return to the impeller chamber (142).

2. The electric pump (100) according to claim 1, characterized in that: The electric pump (100) includes an inlet channel (23), and at least part of the wall forming the inlet channel (23) is located in the second housing (1212), at least part of the inlet channel (23) extends along the axial direction of the electric pump (100), along the radial direction of the electric pump (100), the inlet channel (23) is located radially outside the outer part (254) of the first assembly (25), the inlet channel (23) can store or flow the working medium, one end of the inlet channel (23) communicates with the impeller chamber, and the other end of the inlet channel (23) is indirectly communicated with the first return channel (20). When the electric pump (100) is working, the pressure of the working medium at the connection between the impeller chamber (142) and the inlet channel (23) is greater than the pressure of the working medium at the connection between the impeller chamber (142) and the first return channel (20).

3. The electric pump (100) according to claim 2, characterized in that: The second housing (1212) includes an outer peripheral side wall portion (1212c), along the radial direction of the electric pump (100), the outer peripheral side wall portion (1212c) is located radially outside the outer part (254) of the first assembly (25), and along the axial direction of the electric pump (100), part of the inlet channel (23) extends in the outer peripheral side wall portion (1212c).

4. The electric pump (100) according to claim 3, characterized in that: Along the radial direction of the electric pump (100), the wall portion corresponding to the inflow channel (23) includes a first wall portion (231) and a second wall portion (232). Along the radial direction of the electric pump (100), the first wall portion (231) is farther from the stator winding (122) than the second wall portion (232). The outer peripheral side wall portion (1212c) includes an outer wall portion (1212e) and an inner wall portion (1212f). Along the radial direction of the electric pump (100), the outer wall portion (1212e) is farther from the stator winding (122) than the inner wall portion (1212f). Along the radial direction of the electric pump (100), the second wall portion (232) is farther from the stator winding (122) than the inner wall portion (1212f).

5. The electric pump (100) according to any one of claims 2 to 4, characterized in that: The electric pump (100) includes a communication cavity (16). The electric pump (100) includes a partition portion (13). The partition portion (13) is fixedly sealed with the bottom portion (1212d). The wall portion corresponding to the communication cavity (16) includes a part of the bottom portion (1212d) and a part of the partition portion (13). The other end of the inflow channel (23) communicates with one end of the communication cavity (16). The first return channel (20) communicates with the communication cavity (16).

6. The electric pump (100) according to any one of claims 2 to 5, characterized in that: The impeller cavity (142) includes a volute cavity (1421) and a non-volute cavity (1422). When the electric pump (100) operates, the pressure of the working medium in the volute cavity (1421) is greater than the pressure of the working medium in the non-volute cavity (1422). One end of the inflow channel (23) communicates with the volute cavity (1421). The other end of the first return channel (20) communicates with the non-volute cavity (1422).

7. The electric pump (100) according to claim 5 or 6, characterized in that: The wall portion corresponding to the communication cavity (16) includes a peripheral portion (161). Define a first reference plane (101). The first reference plane (101) is a plane parallel to the plane where the positive bottom surface (1212g) of the bottom portion (1212d) is located. The peripheral portion (161) includes a first peripheral portion (1611) and a second peripheral portion (1612). The first peripheral portion (1611) and the second peripheral portion (1612) are oppositely arranged. Project the first peripheral portion (1611), the second peripheral portion (1612), and the stator winding (122) onto the first reference plane (101). Along the radial direction of the electric pump (100), the projection contour lines of the first peripheral portion (1611) and the second peripheral portion (1612) are radially outside the projection contour line of the outer side portion of the stator winding (122).

8. The electric pump (100) according to claim 7, characterized in that: The peripheral part (161) includes a third peripheral part (1613) and a fourth peripheral part (1614). The third peripheral part (1613) and the fourth peripheral part (1614) are oppositely arranged. The first peripheral part (1611) and the second peripheral part (1612) are connected by the third peripheral part (1613) and the fourth peripheral part (1614). Project the third peripheral part (1613), the fourth peripheral part (1614), and the stator winding (122) onto the first reference plane (101). Along the radial direction of the electric pump (100), the projection contour lines of part of the third peripheral part (1613) and part of the fourth peripheral part (1614) are located radially inside the projection contour line of the outer part of the stator winding (122).

9. The electric pump (100) according to any one of claims 5 to 8, characterized in that: The second housing (1212) includes a cylindrical part (1212a). Along the axial direction of the electric pump (100), the bottom (1212d) is located on one side of the cylindrical part (1212a). The electric pump (100) has a rotor cavity (141). The wall part corresponding to the rotor cavity (141) includes the cylindrical part (1212a) and the opposite bottom surface (1212h) of part of the bottom (1212d). Define the part of the opposite bottom surface (1212h) of the wall part forming the rotor cavity (141) as the bottom surface (1411). Along the radial direction of the electric pump, the area of the communication cavity (16) is larger than the area of the bottom surface (1411).

10. The electric pump (100) according to claim 9, characterized in that: The electric pump (100) includes a conductive part (271). The stator winding (122) includes a winding (1223). One end of the conductive part (271) is electrically connected to the winding (1223). The bottom (1212d) includes a positive bottom surface (1212g) and an opposite bottom surface (1212h). Along the axial direction of the electric pump (100), the positive bottom surface (1212g) is closer to the partition part (13) than the opposite bottom surface (1212h). The positive bottom surface (1212g) includes a covering surface (1212m) and an open surface (1212n). Define the part of the positive bottom surface (1212g) covered by the partition part (13) as the covering surface (1212m), and the part not covered by the partition part (13) as the open surface (1212n). The partition part (13) is hermetically fixed to the covering surface (1212m). Define a first reference plane (101). The first reference plane (101) is perpendicular to the axial direction of the electric pump (100). Project the covering surface (1212m), the open surface (1212n), and the part where the conductive part (271) is connected to the winding (1223) onto the first reference plane (101). The part where the conductive part (271) is connected to the winding (1223) is located within the projection area of the open surface (1212n).

11. The electric pump (100) according to any one of claims 1 to 10, characterized in that: The electric pump (100) includes a bottom case (26) and a connector (272). The bottom case (26) is formed by insert injection molding with at least the connector (272) as an insert. The bottom case (26) is separately provided from the stator housing (121), and the bottom case (26) is fixedly connected to the stator housing (121).

12. The electric pump (100) according to claim 11, characterized in that: The bottom case (26) includes a support portion (261). The support portion (261) is formed by insert injection molding with at least the connector (272) as an insert. The connector (272) includes a first electrical connection section (2721), an injection molding section (2722), and a power supply connection section (2723). The first electrical connection section (2721) is electrically connected to the stator winding (122). The first electrical connection section (2721) is located at one end of the injection molding section (2722). The power supply connection section (2723) is located at the other end of the injection molding section (2722). The power supply connection section (2723) is used for electrically connecting to an external power supply. At least part of the injection molding section (2722) is embedded in the support portion (261).

13. The electric pump (100) according to claim 11 or 12, characterized in that: The electric pump (100) includes a control board assembly or an adapter board assembly (22). The first electrical connection section (2721) of the connector (272) is electrically connected to the control board assembly or the adapter board assembly (22). The electric pump (100) includes a conductive member (271). One end of the conductive member (271) is electrically connected to the stator winding (122), and the other end of the conductive member (271) is electrically connected to the control board assembly or the adapter board assembly (22).

14. The electric pump (100) according to claim 13, characterized in that: The bottom case (26) has a jack (263). Along the axial direction of the electric pump (100), the other end of the conductive member (271) extends within the jack (263), and the other end of the conductive member (271) is electrically connected to the control board assembly or the adapter board assembly (22).

15. The electric pump (100) according to claim 12, characterized in that: Along the axial direction of the electric pump (100), the first electrical connection section (2721) extends away from the stator winding (122) from the support portion (261). Along the radial direction of the electric pump (100), the power supply connection section (2733) is located radially outside the first electrical connection section (2721). The power supply connection section (2723) extends away from the stator winding (122) from the support portion (261). Along the axial direction of the electric pump (100), the control board assembly or the adapter board assembly (22) is relatively far from the stator winding (122) with respect to at least part of the injection molding section (2722).

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